In hypertensive crisis, which phenylephrine concentration should be avoided for adult dilation?

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Prepare for the Ophthalmic Medications Test with flashcards and multiple choice questions. Each question includes hints and explanations to enhance your understanding. Gear up for your exam!

Multiple Choice

In hypertensive crisis, which phenylephrine concentration should be avoided for adult dilation?

Explanation:
Phenylephrine dilates the pupil by acting on alpha-1 receptors in the iris dilator muscle, but if it enters the bloodstream it causes systemic vasoconstriction and can raise blood pressure. In a hypertensive crisis, the aim is to minimize systemic exposure, so the strongest concentration carries the highest risk of a dangerous BP spike. Therefore, the 10% solution should be avoided for adult dilation in this setting, and if dilation is necessary, a lower concentration (such as 2.5% or 5%) should be used with careful monitoring.

Phenylephrine dilates the pupil by acting on alpha-1 receptors in the iris dilator muscle, but if it enters the bloodstream it causes systemic vasoconstriction and can raise blood pressure. In a hypertensive crisis, the aim is to minimize systemic exposure, so the strongest concentration carries the highest risk of a dangerous BP spike. Therefore, the 10% solution should be avoided for adult dilation in this setting, and if dilation is necessary, a lower concentration (such as 2.5% or 5%) should be used with careful monitoring.

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